DF70A won't start

I have DF70A that acts like is totally dead - Turn key to "ON" - nothing. Turn key to "Start" - nothing.

Good power and ground to engine.

All fuses check good on ohm meter.

Power to and from all fuses except "IAC"

Swapped main relay with start relay, swapped main fuse.

I do not have a wiring diagram, but the best I can tell, there is no +12V to the ignition switch. But without knowing the wire colors, I'm just going in circles.

I traced the wiring back to the engine, then to a large circular connector inside the lower front portion of the cowling, below the power head. From there, who knows?

Any ideas, anyone?

Thanks in advance.

Thanks to the techs at Chatlee Boats and Marine in Sanford, NC for the answer.

Attached to the Positive(+) battery terminal is a white wire with a fuse holder. This lead supplies +12V to the ECM for the engine and for the ignition switch. This is a 15A fuse and was blown.

Replaced the fuse and all is well.

Thanks guys!